Hi and welcome to my laboratory. My name is Violet Drop. I am a scientist who studies all about pony kind and the uniqueness of each type of pony, from Earth Ponies, Unicorns, Pegasi, and Alicorns. Not to bore you to death with all the boring bits, I’ll be skipping to the interesting parts.
Let’s get straight to it…
The best type of pony I would recommend to a slime pony to absorb will always be Alicorns. The only downside is how rare it is to come across one. You have a higher chance of finding a changeling disguised as a pony than meeting an alicorn in pony.
So the second best will be Unicorns, due to how delicious the magic can be. They are definitely the sweetest out of the 4 types and their magic can be useful in many ways.
The third best is the Pegasus. Their wings are tasty and can be good for flying to high places. Catching a Pegasus will be quite a challenge, but I’m sure slime mares like Red Drop will have no issues at all with catching up to one.
And the very last one is Earthponies. They can be great for a quick snack especially when you’re not in the mood for a challenge. However, you may want to prepare your tummy before gulping down that earth pony prey. They are known for getting predator stomachaches due to how strong their kicks are and that they struggle more than the other 3 types.
(And this part doesn’t go into the lore of slime ponies but the other parts should. This is more of how they see ponies as food. They do eat normal food (and pretty much anything their stomach can break down/melt) So they don’t eat them all the time, just every now and then. As tasty as ponies can be, the last thing Princess Gumdrop wants is Celestia to start something against the slime ponies.